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Primary 4 Mathematics · Chapter 6 · Answers and explanations

Lesson 6.3: Word Problems: Adding and Subtracting Fractions (answers)

Section A · Multiple choice 4 marks

1. Mei used 38 m of ribbon for a bow and 14 m of ribbon for a card. How many metres of ribbon did she use in all?1 mark

382858
(A) 412(B) 18(C) 58(D) 34
Answer: (C) 5814 = 28. 38 + 28 = 58. She used 58 m.

2. A jug had 710 L of milk. 25 L was poured out. How many litres of milk were left?1 mark

41031071025?
(A) 55(B) 12(C) 910(D) 310
Answer: (D) 31025 = 410. 710 − 410 = 310. 310 L was left.

3. Ben ate 13 of a cake. Cara ate 16 of the cake. What fraction of the cake was left?1 mark

Cake1316?1
(A) 12(B) 23(C) 56(D) 16
Answer: (A) 1213 = 26. Eaten: 26 + 16 = 36.
Left: 66 − 36 = 36 = 12.

4. A rope is 2 m long. 34 m of it is cut off. How many metres of rope are left?1 mark

34? m2 m
(A) 14(B) 1 14(C) 1 34(D) 2 34
Answer: (B) 1 142 = 1 + 44. 44 − 34 = 14. So 1 + 14 = 1 14. The rope left is 1 14 m.

Section B · Write your answer 11 marks

5. Jun walked 25 km to the shop. Then he walked another 310 km to the park. How far did he walk in all?1 mark

25310710
Answer: 710 km25 = 410. 410 + 310 = 710. He walked 710 km.

6. Tom poured 12 L of juice into a jug. He then poured 34 L more. How much juice was in the jug?1 mark

1234? L
Answer: 1 14 L12 = 24. 24 + 34 = 54 = 1 14. There was 1 14 L of juice.

7. A ribbon is 1 m long. 38 m is cut off. How long is the ribbon that is left?1 mark

38? m1 m
Answer: 58 m1 = 88. 88 − 38 = 58. The ribbon left is 58 m.

8. A plank is 3 m long. A carpenter saws off 1 35 m. How long is the plank that is left?1 mark

135? m3 m
Answer: 1 25 m3 − 1 = 2. 2 − 35 = 1 + (55 − 35) = 1 + 25 = 1 25.
The plank left is 1 25 m.

9. Sara spent 14 of her money on a book and 38 of her money on a pen. What fraction of her money was left?1 mark

Money1438?1
Answer: 3814 = 28. Spent: 28 + 38 = 58.
Left: 88 − 58 = 38.

10. Jar A has 34 kg of flour. Jar B has 18 kg less flour than Jar A. How much flour is there in the two jars altogether?2 marks

Jar A34Jar B5818
Answer: 1 38 kgJar B: 34 = 68, so 68 − 18 = 58 kg.
Both jars: 68 + 58 = 118 = 1 38. There is 1 38 kg of flour.

11. Mrs Lim bought 2 12 kg of rice. She used 34 kg on Monday and 1 14 kg on Tuesday. How much rice was left?2 marks

34114? kg212
Answer: 12 kgUsed: 34 + 1 14 = 1 44 = 2 kg.
Left: 2 12 − 2 = 12 kg.

12. Dev cycled 34 km on Monday. On Tuesday he cycled 12 km farther than on Monday. How far did he cycle in the two days altogether?2 marks

Mon34Tue341254
Answer: 2 kmTuesday: 34 + 12 = 34 + 24 = 54 km.
Total: 34 + 54 = 84 = 2 km.
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